CN113552912A - Temperature adjusting method for thermal engineering laboratory - Google Patents
Temperature adjusting method for thermal engineering laboratory Download PDFInfo
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- CN113552912A CN113552912A CN202110924225.6A CN202110924225A CN113552912A CN 113552912 A CN113552912 A CN 113552912A CN 202110924225 A CN202110924225 A CN 202110924225A CN 113552912 A CN113552912 A CN 113552912A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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Abstract
The invention discloses a temperature adjusting method for a thermotechnical experiment room. The method comprises the following steps: presetting n temperature difference threshold values and starting-up quantity; when the absolute value of the difference value between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is greater than the 1 st temperature difference threshold value, all air conditioners in the air conditioning unit are started to adjust the temperature; when the absolute value of the difference between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the jth temperature difference threshold value and larger than the (j + 1) th temperature difference threshold value, adjusting the temperature by using the jth startup number of air conditioners; and when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the nth temperature difference threshold value, the temperature is adjusted by using the nth starting number of air conditioners. The air temperature adjusting method can quickly and accurately control the air temperature in the thermal engineering experiment room to be close to the target experiment air temperature value, thereby creating a stable air temperature environment for the thermal engineering experiment and improving the accuracy of data obtained by the thermal engineering experiment.
Description
Technical Field
The invention relates to a thermotechnical experiment technology, in particular to a thermotechnical experiment room air temperature adjusting method.
Background
The thermal laboratory is an experimental facility for detecting the heat preservation performance of refrigeration equipment, such as a refrigerator, a refrigerator car, and the like, which are objects to be detected, and is widely adopted by most refrigeration equipment manufacturers.
The thermal engineering laboratory generally comprises a main laboratory, an air conditioning duct, an air conditioning unit, a circulating fan unit, a control terminal and the like. The air vents at the two ends of the main laboratory are respectively communicated with the air duct openings at the two ends of the air-conditioning air duct, so that a circulating air passage is formed. The circulating fan set is arranged in the air-conditioning air duct, and air in the main experiment room and the air-conditioning air duct can realize circulating flow under the blowing effect of the circulating fan set. The air conditioning unit is also arranged in the air conditioning duct, and the air conditioning unit can adjust the air temperature in the main laboratory by adjusting the temperature of the circulating air, so that the required environment air temperature is created for the thermotechnical experiment. The experimental object product is placed in the main laboratory, and then the thermotechnical experiment can be carried out on the experimental object product.
At present, when the air temperature in a main experimental room is adjusted by an air conditioning unit, all air conditioners in the air conditioning unit are controlled to be started completely, and the air temperature in the main experimental room is adjusted to a target experimental air temperature value by all the air conditioners in the air conditioning unit. The method for adjusting the air temperature by using all air conditioners in the air conditioning unit has a large thermal inertia effect. Specifically, when the air conditioning unit is completely closed, the air conditioning unit still can convey a large amount of hot air into the main experimental room and the air in the main experimental room still can rise due to various reasons that certain heat is not dissipated from the radiating fins in the air conditioning unit, a large amount of hot air is not discharged from the pipelines of the air conditioning unit, and the like, which is the thermal inertia effect. Due to the fact that the large thermal inertia effect exists, air temperature regulation fluctuation in the main experiment room is large, and therefore accuracy of data obtained in a thermotechnical experiment is greatly affected.
Disclosure of Invention
The invention aims to provide an air temperature adjusting method for a thermal engineering experiment room, which can quickly and accurately adjust the air temperature in the thermal engineering experiment room to be close to a target experiment air temperature value, thereby creating a stable air temperature environment for a thermal engineering experiment and improving the accuracy of data obtained by the thermal engineering experiment.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a temperature adjusting method for a thermal engineering laboratory comprises the following steps:
and 4, when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the nth temperature difference threshold value, controlling the number of the air conditioners in the air conditioning unit in the starting operation state to be equal to the nth starting number according to the nth starting number, and adjusting the temperature in the thermal engineering laboratory by using the nth starting number of the air conditioners.
Further, the value of n is 2.
Further, among 2 preset temperature difference threshold values, the 1 st temperature difference threshold value is a first temperature difference threshold value, and the 2 nd temperature difference threshold value is a second temperature difference threshold value, wherein the first temperature difference threshold value is 2 ℃, and the second temperature difference threshold value is 1 ℃.
Further, of the preset 2 boot quantities, the 1 st boot quantity is a first boot quantity, and the 2 nd boot quantity is a second boot quantity, where the first boot quantity takes the value of 2 and the second boot quantity takes the value of 1.
Furthermore, the number of the air conditioners in the air conditioning unit is more than 2.
Further, the number of the air conditioners in the air conditioning unit is 4.
In the air temperature adjusting method, when the absolute value of the difference between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is large, more air conditioners are used for adjusting the air temperature in the thermal engineering laboratory, so that the air temperature in the thermal engineering laboratory can be quickly close to the target experimental air temperature value, and the thermal inertia effect at the moment has no influence on the final accurate adjustment of the target experimental air temperature value; when the absolute value of the difference between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is small, the air temperature in the thermotechnical experiment room is adjusted by using fewer air conditioners, so that the air temperature in the thermotechnical experiment room can gradually approach the target experiment air temperature value, the thermal inertia effect is gradually reduced along with the reduction of the number of the started air conditioners, and the influence of the thermal inertia effect on the final accurate adjustment of the target experiment air temperature value is reduced; when the temperature in the thermotechnical experiment room is very close to the target experiment temperature value, the temperature in the thermotechnical experiment room is adjusted by using the air conditioners as few as possible, the thermal inertia effect at the moment is very small, the fluctuation for adjusting the temperature in the thermotechnical experiment room is also very small, and the temperature in the thermotechnical experiment room can be stabilized in a very small range near the target experiment temperature value, so that a stable temperature environment is created for the thermotechnical experiment, and the accuracy of the data obtained by the thermotechnical experiment is improved.
Compared with the prior art, the air temperature adjusting method has the advantages that: the air temperature adjusting method determines the starting number of the air conditioners according to the difference condition of the air temperature in the thermal engineering experiment room and the target experiment air temperature value, when the difference value is larger, the air temperature in the thermal engineering experiment room can quickly reach the target experiment air temperature value, and when the difference value is smaller, the air temperature in the thermal engineering experiment room can be stabilized near the target experiment air temperature value, so that a stable air temperature environment is created for thermal engineering experiments, and the accuracy of data obtained by the thermal engineering experiments is improved.
Drawings
FIG. 1 is a schematic structural diagram of an air temperature adjustment object thermal engineering laboratory of the air temperature adjustment method of the thermal engineering laboratory;
fig. 2 is a flowchart of an air temperature adjustment method according to an embodiment of the present invention.
In the figure: 1-main experimental room, 11-air inlet, 12-air return inlet, 2-peripheral room body, 3-air conditioning air duct, 4-circulating fan unit, 5-air conditioning unit, 6-control terminal, 7-temperature sensor and 30-experimental object product.
Detailed Description
The invention will be further described with reference to the following figures and specific examples:
the embodiment provides an air temperature adjusting method for a thermal engineering experiment room, which can quickly and accurately control the air temperature in the thermal engineering experiment room to be close to a target experiment air temperature value.
Referring to fig. 1, the background of the present embodiment is a thermal engineering laboratory of a certain manufacturer, as shown in fig. 1, the thermal engineering laboratory is an air temperature adjustment object of the air temperature adjustment method of the present embodiment.
The thermotechnical experiment room comprises a main experiment room 1, a peripheral room body 2, an air conditioning air duct 3, a circulating fan unit 4, an air conditioning unit 5, a control terminal 6 and a plurality of temperature sensors 7. The main experiment room 1 is used for placing an experiment object product 30 which needs to be subjected to a thermotechnical experiment, vent holes are arranged at two ends of the main experiment room 1, and the vent holes at two ends of the main experiment room 1 are respectively an air inlet 11 and an air return port 12. The peripheral room body 2 wraps the outer side of the main laboratory room 1, and continuous air separation is arranged between the top of the peripheral room body 2 and the main laboratory room 1 and between the two ventilation openings, wherein the air separation at the top of the main laboratory room 1 is used as the air conditioning air duct 3, and the air separation at the two ventilation openings of the main laboratory room 1 can be used as air duct openings at two ends of the air conditioning air duct 3. The air vents at the two ends of the main laboratory are respectively communicated with the air duct openings at the two ends of the air-conditioning air duct, so that a circulating air passage is formed. The circulating fan set 4 is arranged in the air-conditioning air duct 3, the circulating fan set 4 is controlled to be connected to the control terminal 6, and air in the main experiment room 1 and the air-conditioning air duct 3 can circularly flow under the blowing effect of the circulating fan set 4. The air conditioning unit 5 is also arranged in the air conditioning duct 3, 4 air conditioners are arranged in the air conditioning unit 5, the air conditioning unit 5 is connected to the control terminal 6 in a controlled manner, and the air conditioning unit 5 can adjust the air temperature in the main laboratory 1 by adjusting the temperature of circulating air, so that the required environment air temperature is created for thermal engineering experiments. The temperature sensors 7 are discretely arranged in the main laboratory 1, the temperature sensors 7 are in signal connection with the control terminal 6, and the control terminal 6 can acquire the air temperature condition in the main laboratory 1 through the temperature sensors 7.
In other embodiments, the number of air conditioners in the air conditioning unit 5 may be set to 2 or more.
If a thermotechnical experiment is to be performed on the experimental object product 30, the experimental object product 30 is placed in the main laboratory 1, and the circulating fan unit 4 and the air conditioning unit 5 are controlled to be started through the control terminal 6, so that the thermotechnical experiment can be performed on the experimental object product 30.
Referring to fig. 2, the air temperature adjustment method of the present embodiment includes the steps of:
It should be noted that, the values of the first temperature difference threshold and the second temperature difference threshold are both positive numbers, and the first temperature difference threshold is greater than the second temperature difference threshold.
It should be noted that the preset temperature difference threshold is a temperature difference value between the temperature in the thermotechnical laboratory and the target experimental temperature value. The target experimental air temperature value is as follows: when the experimental object product is subjected to a thermal experiment, the gas temperature value of the surrounding environment of the experimental object product specified by the experiment is obtained.
Two startup quantities are preset corresponding to the two preset temperature difference thresholds, wherein the two startup quantities are respectively a first startup quantity and a second startup quantity, the first startup quantity takes a value of 2, and the second startup quantity takes a value of 1. In other embodiments, the values of the first boot amount and the second boot amount are not limited to 2 and 1, and the values of the first boot amount and the second boot amount may be determined according to the actual implementation effect of the method.
It should be noted that the values of the first boot amount and the second boot amount are both natural numbers, and the first boot amount is greater than the second boot amount.
It should be noted that the preset starting number is the air conditioning unit arranged in the air conditioning duct of the thermal engineering laboratory, and the meaning is as follows: the number of air conditioners in the air conditioning unit in the on-state operation state, and other air conditioners in the air conditioning unit in the off-state.
And 2, when the absolute value of the difference value between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is larger than a preset first temperature difference threshold value, starting all air conditioners in the air conditioning unit to adjust the temperature in the thermotechnical experiment room.
The air conditioning unit is arranged in an air conditioning duct of the thermal engineering experiment room.
The target experimental air temperature value is as follows: when the thermal experiment is performed on the test object product 30, the temperature value of the ambient environment of the test object product 30 specified by the experiment is determined.
And 3, when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the first temperature difference threshold value and larger than the second temperature difference threshold value, controlling the number of air conditioners in the starting operation state in the air conditioning unit to be equal to the first starting number according to the first starting number, and adjusting the temperature in the thermal engineering laboratory by using the air conditioners in the first starting number.
And 4, when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than a second temperature difference threshold value, controlling the number of air conditioners in the air conditioning unit in the starting operation state to be equal to the second starting number according to the second starting number, and adjusting the temperature in the thermal engineering laboratory by using the air conditioners in the second starting number.
It should be noted that the air temperature in the thermal engineering laboratory is a general term for the air temperature in the space region where the experimental product 30 is placed. For example, in the present embodiment, the air temperature in the thermal laboratory refers to the air temperature in the main laboratory 1 of the thermal laboratory. In other embodiments, the thermal laboratory does not have a main laboratory and a peripheral laboratory, the thermal laboratory is a single-room structure, and the air temperature in the thermal laboratory refers to the air temperature in the single room.
An example is provided below for further illustration:
referring to fig. 1, it is assumed that the temperature sensor 7 detects that the temperature in the thermal engineering test room is 15 ℃ and the target test air temperature value is 30 ℃, and then the temperature in the thermal engineering test room is adjusted from 15 ℃ to 30 ℃ by using the air temperature adjusting method of the present embodiment.
1) The first temperature difference threshold value is 2 ℃, the second temperature difference threshold value is 1 ℃, the first startup number is 2, and the second startup number is 1.
2) At present, the absolute value of the difference between the temperature in the thermal engineering experiment room and the target experiment air temperature value is 30-15=15 ℃ and is greater than 2 ℃ of the first temperature difference threshold value, and at the moment, the control terminal 6 controls all air conditioners in the air conditioning unit 5 to be started, so that the air temperature in the thermal engineering experiment room can be quickly close to the target experiment air temperature value.
3) When the temperature sensor 7 detects that the temperature in the thermal engineering experiment room rises from 15 ℃ to 28-29 ℃, the absolute value of the difference between the temperature in the thermal engineering experiment room and the target experiment temperature value is between 1-2 ℃, the control terminal 6 controls the starting of 2 air conditioners in the air conditioning unit 5 according to the first starting number, the rest of the air conditioners are shut down, and the temperature in the thermal engineering experiment room is adjusted by the 2 air conditioners, so that the temperature in the thermal engineering experiment room gradually approaches the target experiment temperature value.
4) When the temperature sensor 7 detects that the temperature in the thermotechnical experiment room is further increased to 29-30 ℃ from the previous 28-29 ℃, the absolute value of the difference between the temperature in the thermotechnical experiment room and the target experiment temperature value is smaller than 1 ℃, according to the second starting number, the control terminal 6 only controls to start 1 air conditioner in the air conditioning unit 5, the rest air conditioners are shut down, the temperature in the thermotechnical experiment room is adjusted by 1 air conditioner, and the temperature in the thermotechnical experiment room is adjusted to be close to the target experiment temperature value.
The above is the provided embodiment.
In other embodiments, the number of the temperature difference threshold and the number of the boots may be set to n, where n is a natural number, according to the actual situation, and in such a case, the steps of the air temperature adjusting method according to the present embodiment may be summarized as follows:
And 2, when the absolute value of the difference value between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is larger than the preset 1 st temperature difference threshold value, all air conditioners in the air conditioning unit are started to adjust the temperature in the thermotechnical experiment room.
And 4, when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the nth temperature difference threshold value, controlling the number of the air conditioners in the air conditioning unit in the starting operation state to be equal to the nth starting number according to the nth starting number, and adjusting the temperature in the thermal engineering laboratory by using the nth starting number of the air conditioners.
When the air temperature adjusting method of the embodiment is adopted to adjust the air temperature in the thermotechnical experiment room, the starting number of the air conditioners is determined according to the difference condition of the air temperature in the thermotechnical experiment room and the target experiment air temperature value. When the absolute value of the difference between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is large, all air conditioners in the air conditioning unit are used for adjusting the air temperature in the thermotechnical experiment room, so that the air temperature in the thermotechnical experiment room can be quickly close to the target experiment air temperature value, and the thermal inertia effect at the moment has little influence on the final accurate adjustment of the target experiment air temperature value; when the absolute value of the difference between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is smaller, adjusting the air temperature in the thermotechnical experiment room by using 2 air conditioners to ensure that the air temperature in the thermotechnical experiment room can gradually approach the target experiment air temperature value, and the thermal inertia effect at the moment is gradually reduced along with the reduction of the number of the started air conditioners; when the temperature in the thermotechnical experiment room is very close to the target experiment temperature value, the temperature in the thermotechnical experiment room is adjusted by only 1 air conditioner, the thermal inertia effect at the moment is very small, the fluctuation of the temperature in the thermotechnical experiment room is adjusted to be very small, the temperature in the thermotechnical experiment room can be stabilized in a very small range near the target experiment temperature value, a stable temperature environment is created for the thermotechnical experiment, and the accuracy of the data obtained by the thermotechnical experiment is improved.
It should be noted that the air temperature adjusting object of the air temperature adjusting method of the present invention is not limited to the thermal engineering laboratory described in the present embodiment, and the air temperature adjusting method of the present invention may be used for air temperature adjustment in any thermal engineering laboratory that adjusts the air temperature by using an air conditioning unit.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A temperature adjusting method for a thermal engineering laboratory is characterized by comprising the following steps: the method comprises the following steps:
step 1, presetting n temperature difference threshold values, wherein the n temperature difference threshold values are positive numbers; presetting n starting numbers corresponding to the n temperature difference thresholds, wherein the n starting numbers are natural numbers; in the n temperature difference threshold values and the starting-up number, the ith temperature difference threshold value is larger than the (i + 1) th temperature difference threshold value, the ith starting-up number is larger than the (i + 1) th starting-up number, wherein i = 1-n-1;
step 2, when the absolute value of the difference value between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is larger than a preset 1 st temperature difference threshold value, all air conditioners in the air conditioning unit are started to adjust the temperature in the thermotechnical experiment room;
step 3, when the absolute value of the difference value between the air temperature in the thermotechnical experiment room and the target experiment air temperature value is smaller than the jth temperature difference threshold value and larger than the (j + 1) th temperature difference threshold value, controlling the number of air conditioners in the starting operation state in the air conditioning unit to be equal to the jth starting number according to the jth starting number, and adjusting the temperature in the thermotechnical experiment room by using the jth starting number of air conditioners; wherein j = 1-n-1;
and 4, when the absolute value of the difference value between the air temperature in the thermal engineering laboratory and the target experimental air temperature value is smaller than the nth temperature difference threshold value, controlling the number of the air conditioners in the air conditioning unit in the starting operation state to be equal to the nth starting number according to the nth starting number, and adjusting the temperature in the thermal engineering laboratory by using the nth starting number of the air conditioners.
2. The air temperature adjusting method for the thermotechnical laboratory according to claim 1, characterized in that: and the value of n is 2.
3. The air temperature adjusting method for the thermotechnical laboratory according to claim 2, characterized in that: in the preset 2 temperature difference threshold values, the 1 st temperature difference threshold value is a first temperature difference threshold value, and the 2 nd temperature difference threshold value is a second temperature difference threshold value, wherein the value of the first temperature difference threshold value is 2 ℃, and the value of the second temperature difference threshold value is 1 ℃.
4. The air temperature adjusting method for the thermotechnical laboratory according to claim 2, characterized in that: in the preset 2 starting numbers, the 1 st starting number is a first starting number, and the 2 nd starting number is a second starting number, wherein the value of the first starting number is 2, and the value of the second starting number is 1.
5. The air temperature adjusting method for the thermotechnical laboratory according to claim 1, characterized in that: the number of the air conditioners in the air conditioning unit is more than 2.
6. The air temperature adjusting method for the thermal engineering laboratory according to claim 5, characterized in that: the number of the air conditioners in the air conditioning unit is 4.
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| CN202110924225.6A CN113552912A (en) | 2021-08-12 | 2021-08-12 | Temperature adjusting method for thermal engineering laboratory |
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| CN112050346A (en) * | 2020-08-31 | 2020-12-08 | 珠海格力电器股份有限公司 | Method, device and equipment for controlling starting number of air conditioning system and air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001063344A (en) * | 1999-08-31 | 2001-03-13 | Mazda Motor Corp | Vehicular air conditioner |
| CN101398211A (en) * | 2007-09-28 | 2009-04-01 | 中达电通股份有限公司 | Equipment room energy-conserving control method |
| CN102494386A (en) * | 2011-11-18 | 2012-06-13 | 海信（山东）空调有限公司 | Method and system for controlling double-machine backups of air conditioners |
| CN102980274A (en) * | 2012-12-18 | 2013-03-20 | 华为技术有限公司 | Fan control method and device for precision air conditioning system and precision air conditioning system |
| CN107178869A (en) * | 2017-04-24 | 2017-09-19 | 东南大学 | The polymerization control despicking method of convertible frequency air-conditioner load |
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Application publication date: 20211026 |